Improvement in syringes



vP. .1. MCELROY.

Improvement in Syr'inges.

NO. 131,697. Patented Sep. 24,1872.

FFICE.

PATENT PATRICK J. McELRonfor' EAST CAMBRIDGE, MASSACHUSETTS.

IMPROVEMENT 1N svRlNeEs.

Specification forming part of Letters' Patent No. 131,697; dated September 24, 1872.

To all whom it may concern:

Be it known that I, PATRICK J. MoELRoY,

y of East Cambridge, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Enema-Syringes; and that the following is a full, clear, and exact description of the saine, reference being had to the accompanying plate of drawing.

The present invention relates more particularly to glass enema-syringes, although it is applicable to others, but more especially those .'syringe, or upon both, one washer, at least,

being within and one .without the syringebody. The washers obviate the liability of breaking the syringe should the plunger be moved to the full length of its stroke, for in the one or inward movement the outer washer,

and in the other or outward movement the inner washer, abut, respectively, against the head of the syringe body or case, in lieu of, Yas heretofore, the hard and unyielding material of which the plunger, its rod, and its oase, are made.

In the accompanying plate of drawing, my improvement in enema-syringes i's illustrated-Figure 1 being a side view of an enemasyringe having it applied, the body of the syringe being shown as broken away at points, for a more perfect illustration of thisinvention and Fig. 2, a cross-section in plane of line .fr w, Fig. l. A

y a in the drawing represents a glass enemasyringe, of which b is the body 0r case, c the l spoutor nozzle, and d the plunger or piston;

e operating-rod to piston d. The rod e by one l end f passes out of the closed head g to body l `b---said end j bein gdprovided with a knob, h,

for convenience in operating the rod, and a shoulder or collar, e', forming the limit to the inward movement of the plunger. Thehead l 7' to the plunger d forms the limits of the out-` ward movement of plunger. k and l, two`- washers or rings surrounding plunger-rod ai These washers are both made of a material (by preference India rubber, although other materials may be employed,) which is-elastic and susceptible of yielding freely to compression, and in their location upon the rod e one, .70, is within the syringe-body b, against the head j of plunger d, and the other, l, is Without the body against the collar '5, between it and the body-head g. Drawing out the plunger to the full length of its stroke the washer la abuts against the head g, and, pushing in the plunger to the full length of its stroke, the Washer l abuts against the head g, and as both washers are elastic andpyielding they serve to prevent, in a great measure, if not entirely, the possibility of fracture of or other injury to either the body or its plunger and operatingrod, or both and all, however carelessly the syringe may be thus used.

Although herein the washers 7c and Z have been described as being upon the operatingrod e, itis obvious they might be both located in the body-head g, one inside and the other Outside, or the inner washer upon the rod c, and the outerwithin the head g, or vice versa, or both within the head g and upon the rod e,

and yet the same results be attained. It is preferable, however, to locate them as .described, as it is most simple and entirely practical, requiring no special fitting; and although this invention has been herein particularly described in connection with glass 'enema-syringes, it is applicable to other enema-syringes, and therefore it is not intended to limit the invention to any one particular kind of syringes-the greatest advantages, however, being secured with those made of glass.

Having thus described my invention, I shall state my claim as follows:

An enema-syringe, provided with washers k l, substantially as and for the purpose de- 'scribed PATRICK J. MCELROY.

Witnesses:

J. P. MoELRoY, ALBERT W. BROWN. 

